Signaling by wireless telegraphy.



v. TOULSBN. SIGNALING BY WIRELESS TBLEGBAPHY. APPLICATION FILED EABJ, 1907.

966,705.. Patented Aug .9,1910.

mfna-so es; WM 721,

scenes,-

"Io all whom. it may concern:

vannnmaa woman, or cornmmenn, DEN ARK;

srcrmmnc BY WIRELESS TELEGRAPH-II.

Be it known that I, VALDnMAR'PoULsnma subject of the King of Denmark, residing at Copenhagen, Denmark, have invented certain new and usefulflmprovements in Signaling by Wireless Telegraphy, of which the following is a 'full, clear, and exact descri tion.

T is invention relates to a method and apparatus for wireless signaling .by means of continuous electric oscillations produced by means of a generator having an electric are or the like connected with self induction and capacity.- Arrangements for this pur-.'

pose have'been hitherto proposed byme and escribed, for example, 1n Patent No. 793,608, dated June 27 ,"1905, and in which the arc is maintained in an atmosphere of hydrogen or a gas containing hydrogen. 1

The object of the .present invention is to signal in such a manner that the oscillations in the transmitting circuit may, through the 11% of a key heperiodically caused to cease. I accomplish this result byinserting in the oscillationcircuit, or in parallel with a por- .tion of the same, a means for damping the oscillations, so that the oscillations in the aerial are brought to rest either partially or completely. n y

In the drawings I have illustrated embodiments of my invention for accom lishring the above purposes, in which the amping means 15 inserted in the oscillation circult of the generator.

lnthe drawings, Figure 1 is a diagram illustrating a wireless transmitting appara- .tus embodying' the principles of my invention. Fig. 2 shows a slightly modified form of the same. Fi' 3 illustrates a still further slightly mo ified arrangement;

As a damping means, a. non-inductive ohmic resistance may, for example, be used.

. a indicates the are which, combined with an inductance b and a condenser 0, forms the -oscillation circuit directly or inductively I connected with the aerial.

in. Fig. l the oscillation circuit .be closed directly by means of a transmitting key J, so that theohmic resistance c is short v Speciflcatihn of Letters Patent.

Application filedMarch 8, 1907. Serial No. 361,280.

Patented Aug. 9, 1910.

circuited. If the oscillation circuit is opened by means-0f said key d,=the-oscillations will be absorbed bv the ohmic resistance. e' and the system will cease to transmit waves.

"With the form of the invention shown in Fig.2 the same effect isv obtained by placing anohmic resistance 6 in'p'arall'el with a condenser c. The condenser f prevents the current which supplies or maintains the arc from passin through the resistance e.- In t 1e form of the invention shown in Fig. 3 the resistance 6 can, by meansof an operating key (1, be placed in parallel .witht e inductance. b which-[also has the effect of causingthe oscillations to cease. The-damping of the oscillations by the forms of t e invention shown inFigs. 2 and? is due to the fact that, with an oscillation circuit havingpapacity or'inductance, if such capacity i or inductance is shunted .by asuitable ohmic resistance, it is found by experience that the ()SClllatlmlS are caused to'cease.

Itis -to be noted that, in the arrangement of Figs. 2 and 3, the signaling orvtransmis sion of oscillations takes place on the back stroke of the key d, instead of the down 'or circuit-com leti'ng stroke, as in Fig. 1.-

What I claim 182' 1 v 1. A wireless signaling apparatus i'nchiding an electric are, a circuit from said electric arc lncludmg lnductance and capacity, an oscillation damping. devlce, and means for putting such damping device into 'and out of the circuit to absorb the energy there: of in the form of heat. T 2.-A wireless signaling apparatus includin an electric arc, an oscillation circuitbr dged across said are, and means for conncct ng and disconnecting -an ohmic resist-' ance with said circuit to absorb the ener thereof in the form ofheat and revent tie transmission of oscillations there rom.

' In witness whereof, I subscribe my signature, injthe presence of two witnesses.

, VALDEMAR'POULSEN;

'Witnesses:

; Penna OLUF' Pnnnnsnm,

VIcco BLoM. 

